Embedded Template Library (ETL) Example application

examples/etl/Kconfig

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+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config EXAMPLES_ETL
+	tristate "Embedded Template Library (ETL) C++ example"
+	default n
+	depends on HAVE_CXX && ETL
+	---help---
+		Enable the ETL C++ example which showcases the etl::vector container
+		and C++11 iterator

examples/etl/Make.defs

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+############################################################################
+# apps/examples/helloxx/Make.defs
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+ifneq ($(CONFIG_EXAMPLES_ETL),)
+CONFIGURED_APPS += $(APPDIR)/examples/etl
+endif

examples/etl/Makefile

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+############################################################################
+# apps/examples/etl/Makefile
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+include $(APPDIR)/Make.defs
+
+# ETL C++ Example
+
+MAINSRC = etl_main.cxx
+
+# etl built-in application info
+
+PROGNAME = etl
+PRIORITY = SCHED_PRIORITY_DEFAULT
+STACKSIZE = $(CONFIG_DEFAULT_TASK_STACKSIZE)
+MODULE = $(CONFIG_EXAMPLES_HELLOXX)
+
+include $(APPDIR)/Application.mk

examples/etl/etl_main.cxx

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+//***************************************************************************
+// apps/examples/etl/etl_main.cxx
+//
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements.  See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.  The
+// ASF licenses this file to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance with the
+// License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+// License for the specific language governing permissions and limitations
+// under the License.
+//
+//***************************************************************************
+
+//***************************************************************************
+// Included Files
+//***************************************************************************
+
+#include <nuttx/config.h>
+
+#include <cstdio>
+#include <debug.h>
+
+#include <etl/vector.h>
+#include <etl/numeric.h>
+
+//***************************************************************************
+// Definitions
+//***************************************************************************
+// Configuration ************************************************************
+
+// Debug ********************************************************************
+// Non-standard debug that may be enabled just for testing the constructors
+
+#ifndef CONFIG_DEBUG_FEATURES
+#  undef CONFIG_DEBUG_CXX
+#endif
+
+#ifdef CONFIG_DEBUG_CXX
+#  define cxxinfo     _info
+#else
+#  define cxxinfo(x...)
+#endif
+
+typedef etl::vector<int, 10> Data;
+
+//***************************************************************************
+// Private Classes
+//***************************************************************************
+
+class CETL
+{
+  public:
+    CETL(void) : mSecret(42)
+    {
+      cxxinfo("Constructor: mSecret=%d\n", mSecret);
+    }
+
+    ~CETL(void)
+    {
+      cxxinfo("Destructor\n");
+    }
+
+    bool HelloWorld(void)
+    {
+        cxxinfo("HelloWorld: mSecret=%d\n", mSecret);
+
+        // Declare the vector instances.
+        etl::vector<int, 10> v1(10);
+        etl::vector<int, 20> v2(20);
+
+        etl::iota(v1.begin(), v1.end(), 0);  // Fill with 0 through 9
+        etl::iota(v2.begin(), v2.end(), 10); // Fill with 10 through 29
+
+        printf("v1 with 0 through 9\n");
+        for (auto& it : v1) {
+            printf("%i ", it);
+        }    
+        printf("\n");
+
+        printf("v2 with 10 through 29\n");
+        for (auto& it : v2) {
+            printf("%i ", it);
+        }
+        printf("\n");
+
+        return true;
+    }
+
+  private:
+    int mSecret;
+};
+
+//***************************************************************************
+// Private Data
+//***************************************************************************
+
+// Define a statically constructed CHellowWorld instance if C++ static
+// initializers are supported by the platform
+
+#ifdef CONFIG_HAVE_CXXINITIALIZE
+static CETL g_HelloWorld;
+#endif
+
+//***************************************************************************
+// Public Functions
+//***************************************************************************
+
+/****************************************************************************
+ * Name: etl_main
+ ****************************************************************************/
+
+
+extern "C" int main(int argc, FAR char *argv[])
+{
+  // Exercise an explicitly instantiated C++ object
+
+  CETL *pHelloWorld = new CETL;
+  printf("etl_main: Testing ETL from the dynamically constructed instance\n");
+  pHelloWorld->HelloWorld();
+
+  // Exercise an C++ object instantiated on the stack
+
+  CETL HelloWorld;
+
+  printf("etl_main: Testing ETL from the instance constructed on the stack\n");
+  HelloWorld.HelloWorld();
+
+  // Exercise an statically constructed C++ object
+
+#ifdef CONFIG_HAVE_CXXINITIALIZE
+  printf("etl_main: Testing ETL from the statically constructed instance\n");
+  g_HelloWorld.HelloWorld();
+#endif
+
+  delete pHelloWorld;
+  return 0;
+}